87654521 has 2 divisors, whose sum is σ = 87654522. Its totient is φ = 87654520.

The previous prime is 87654509. The next prime is 87654547. The reversal of 87654521 is 12545678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86955625 + 698896 = 9325^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 87654521 - 2¹⁰ = 87653497 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p_5088953 and since 87654521 and 5088953 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (87654551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43827260 + 43827261.

It is an arithmetic number, because the mean of its divisors is an integer number (43827261).

Almost surely, 2^87654521 is an apocalyptic number.

It is an amenable number.

87654521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87654521 is an equidigital number, since it uses as much as digits as its factorization.

87654521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 87654521 is about 9362.3993185508. The cubic root of 87654521 is about 444.2131801675.

The spelling of 87654521 in words is "eighty-seven million, six hundred fifty-four thousand, five hundred twenty-one".